Quartapounds SatNOGS Rotator v3.1

Very good job.
I Think that after rotator is finish you must shield pcb because the stepper motor RF noise is very strong. A hammond metallic box or similar is required for eliminate RF noise

IZ5RZR

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YES I will make an aluminum box to reduce the radio interference generated by the stepers.
Rémy.

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Help … the v3.1 rotor works well, except the optical endstops, I did the tests on all the ports endstop of the shield board, it does not work, I put LOW in the line (#define DEFAULT_HOME_STATE LOW // endstops do not work, does anyone have an idea?:cry::cry::cry:

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I don’t know what signal your optical end stops are using, I modified my sketch for standard mechanical switches, and the CNC Shield uses ground has a signal for its and stop switches I believe, which is why I had to change it from high to low. Have you tried setting it too high to see if it works?

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Hello, soon the final operation, I extended the rotor down to incorporate the following elements (12v outlets and usb / rs485 converter) the tests will be done with PstRotator.
Rémy.

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Been awhile since I’ve posted on my thread! I have been playing around with HRPT this weekend and the Satnogs rotator with modified 2.4ghz dish, and have had great success with Tysonpower’s free script. I plan on trying XHRPT from USA-Satcom next. the rotator is working perfectly with gpredict. I havent completely weatherproofed it to stay outside yet, it can bet setup in a few minutes, the rotator drops onto the tripod, and the satellite drops onto the screws, then the counterweight. it’s hacked together but it works great and took minimal time. here’s some pictures from today!


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well, I haven’t fixed the meridian pass issue yet,and it’s causing problems. I’m going to start looking into how to implement other fixes… from my initial research, it’s not a quick ‘cut and paste’ of code. the only one that functions with my setup seems to require some buttons installed in the arduino to zero out the az/el… the meridian pass flip issue just ruined a perfect 85degree NOAA19 HRPT pass… missing a big slice out of the middle of an otherwise perfect image. I’m going to start reading the meridian pass threads and try to get it working for my rotator… can’t have this happen again!

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Fengyun 3C HRPT

MetOp-B HRPT

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My rotator is now weather tested! it has been outside, 24/7 for the past two weeks, over numerous heavy rainstorms, fully functioning and 100% powered the entire time.

here are some pictures of my waterproofness. I have changed the satellite to a normal position instead of the skew in the pictures as well and the signal strength has greatly improved.

I have been tracking HRPT satellites with great success, very strong consistent signal, even from the birds that are a bit harder to track like FengYuns or MetOps.

I send the rotator back to the GOES 16 position for HRIT/LRIT when not tracking usually where it keeps the dish pointed well enough to maintain less than 200 viterbi rate error



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I spent a lot of time this afternoon trying both Meridian Pass scripts… one I got communicating with Gpredict, and successfully controlling the motor… but it would randomly do unexpected things as I was testing it manually.

this one I couldn’t get to communicate with Gpredict or control the motors at all The "MERIDIAN FLIP" Fix for arduino software - repositioning rotator

NOAA 18 HRPT pass this afternoon. 39degree pass.

recent GOES 16 image. the rotator parks on GOES 16 when it’s not tracking.

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GOES Hurricane Dorian Mesoscale GIF I made (with Satnogs rotator pointed at GOES East)

close up of Hurricane Dorian (GOES East Mesoscale)

HRPT tracked with the rotator

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i did all the steps from that page, but the rotor dont start move, can help me
i do the test and this is the result
C:\hamlib-w32-3.3\bin>rotctld -m 202 -r COM3 -s 9600 -T 127.0.0.1 -t 4533 -C timeout=500 -C retry=0 -vvvvvvvvvvvvvvv
rotctld, Hamlib 3.3
Report bugs to hamlib-developer@lists.sourceforge.net

rot_init called
initrots3_easycomm called
rot_register (201)
rot_register (202)
rot_register (204)
rot_token_lookup called
rot_confparam_lookup called
rot_set_conf called
rot_confparam_lookup called
rot_set_conf: timeout=‘500’
frontrot_set_conf called
rot_token_lookup called
rot_confparam_lookup called
rot_set_conf called
rot_confparam_lookup called
rot_set_conf: retry=‘0’
frontrot_set_conf called
rot_open called
serial_open called
serial_setup called
Opened rot model 202, ‘EasycommII’
rig_strstatus called
Backend version: 0.4, Status: Beta
Connection opened from techsmith:65459
rotctl(d): p ‘’ ‘’ ‘’ ‘’
rot_get_position called
easycomm_rot_get_position called
easycomm_transaction called: AZ EL

serial_flush called
write_block called
write_block(): TX 7 bytes
0000 41 5a 20 45 4c 20 0a AZ EL .
read_string called
read_string(): RX 18 characters
0000 41 5a 2d 31 38 34 2e 35 20 45 4c 2d 31 38 30 2e AZ-184.5 EL-180.
0010 30 0a 0.
easycomm_transaction read_string: AZ-184.5 EL-180.0

easycomm_rot_get_position got response: AZ-184.5 EL-180.0

rotctl(d): P ‘150,68’ ‘0,92’ ‘’ ‘’
rot_set_position called
easycomm_rot_set_position called: 150.000000 0.000000
easycomm_transaction called: AZ150.0 EL0.0 UP000 XXX DN000 XXX

serial_flush called
write_block called
write_block(): TX 34 bytes
0000 41 5a 31 35 30 2e 30 20 45 4c 30 2e 30 20 55 50 AZ150.0 EL0.0 UP
0010 30 30 30 20 58 58 58 20 44 4e 30 30 30 20 58 58 000 XXX DN000 XX
0020 58 0a X.
rotctl(d): p ‘’ ‘’ ‘’ ‘’
rot_get_position called
easycomm_rot_get_position called
easycomm_transaction called: AZ EL

serial_flush called
write_block called
write_block(): TX 7 bytes
0000 41 5a 20 45 4c 20 0a AZ EL .
read_string called
read_string(): RX 18 characters
0000 41 5a 2d 31 38 34 2e 35 20 45 4c 2d 31 38 30 2e AZ-184.5 EL-180.
0010 30 0a 0.
easycomm_transaction read_string: AZ-184.5 EL-180.0

easycomm_rot_get_position got response: AZ-184.5 EL-180.0

Wanted to provide another update, the rotator has now been outside for the past 6 months straight.

I have not had ANY issues with the rotator, it has been 100% reliable, and I’ve found that my 3D printed PETG enclosure has worked very well…
temperatures here in Southern Ontario Canada have been as low as -20C and as high as 33C… heavy rain, winds, snow and ice have not stopped it from working.

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Hello @quartapound, congrats on your work !
I also plan to build a rotator v3.1 and am also looking for a dish. You seem to use the TP-Link ANT2424B antenna, what did you have to modify to have it work on weather satellites ? I’m mostly interested in the 2.2-2.4GHz region but having the possibility to go down to weather satellites would be great, but probably these frequencies are too far apart.
Alternatively there would be ANT2424MD that seems to have a wider range from the specs (2.3-2.7GHz instead of 2.4-2.5GHz) and maybe as it has 2 orthogonal feeds it could be used to produce RHCP using a phasing line and a combiner.

that’s what I did, simply add a spacer to the front reflector. I get Viterbi error rate as low as 36 on GOES16 using XRIT decoder. works great. i got the MMNOX 24 dBi Parabolic Antenna (SHD-D-2400-9)

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when i start rotctld.bat this open a black window and after its close by it self, i dont know why?

Rotator in action during high winds

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Awesome! Thanks for all your hard work and for posting this. This is exactly what I was looking for. I’m using this as a template for my SatNOGS rotator build v3.1 (stepper motor version).

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Hello
Beautiful video of the HRPT antenna with reception and decoding.
Finally using the Satnogs rotor it is possible to receive the hrpt.
To support the 24 db grid antenna I use the 5:18 gear stepper motor rotor which has a little more strength, but I see that even with the classic stepper motor you can use a counterweight to solve the problem.
I too will have to make a suitable counterweight. I was thinking of an aluminum square tube like you did and basically create some container with the 3d printer in order to put some weight on it.
For the meridian flip problem I currently have no problems because I use the modified satnogs firmware version.
Do you recommend the satcom software as a software or can you decode well even with the linux versions?
What pc do you recommend?

Hello and congratulations
IZ5RZR

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Heavy Storm, but the rotator works perfectly!

Iz5zr - I don’t have experience decoding with Linux. My understanding is you can’t decode all the HRPT satellites with Linux, and Satcom’s xHRPT is by far the best one out there. Some of the satellites require a fairly powerful PC for live decoding (fengyun and metop if I recall). They’re recommend 4 cores at 3ghz if I remember correctly

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